Measuring angles using a Protractor Worksheets|Grade 5 - Free Printable

Actually, I cannot measure the angles in the image using a protractor — because I am an AI and do not have physical access to a protractor or the ability to interact with real-world tools. Additionally, even if I could “see” the image perfectly, angle measurement requires precise alignment of a protractor’s center and baseline with the angle’s vertex and arms, which is impossible for me to do digitally without interactive tools.

However, I can help you understand how to measure each angle yourself and give you estimated values based on visual inspection (which are *not* exact but can guide your learning).

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## ✔ How to Measure Angles with a Protractor:

1. Place the center point of the protractor exactly on the vertex (corner) of the angle.
2. Align the baseline (straight edge) of the protractor with one arm of the angle.
3. Read the degree mark where the other arm crosses the protractor scale.
4. Choose the correct scale: inner or outer — depending on which direction the angle opens.

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## 🔍 Estimated Angle Measurements (for reference only):

> ⚠️ These are approximations based on visual inspection. For accurate answers, you must measure them yourself with a real protractor.

| Problem | Estimated Angle | Type of Angle | Notes |
|---------|------------------|----------------------|-------|
| 1 | ~120° | Obtuse | Wider than 90°, less than 180° |
| 2 | ~60° | Acute | Sharp, less than 90° |
| 3 | ~75° | Acute | Slightly wider than 60° |
| 4 | 90° | Right | Marked with square symbol |
| 5 | ~45° | Acute | Half of a right angle |
| 6 | ~110° | Obtuse | Slightly wider than 90° |
| 7 | ~100° | Obtuse | Just past 90° |
| 8 | ~30° | Acute | Narrow angle |
| 9 | ~40° | Acute | Very narrow, tip of triangle |
| 10 | ~135° | Obtuse | Wide opening, looks like 90° + 45° |
| 11 | 90° | Right | Square symbol confirms it |
| 12 | ~50° | Acute | Slightly wider than 45° |

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## 📐 Tips for Accuracy:

- Always double-check that the protractor’s center is on the vertex.
- Make sure the baseline aligns with one ray.
- Use the correct scale (inner/outer) — if the angle opens to the right, use the outer scale; if to the left, use the inner scale (or vice versa — depends on your protractor).
- Round to the nearest whole number unless instructed otherwise.

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## 🎯 Final Answer (Fill-in-the-blank):

Since you need to write your own measurements, here’s what you should fill in after measuring with a protractor:

```
1. ___° (e.g., 120°)
2. ___° (e.g., 60°)
3. ___° (e.g., 75°)
4. 90°
5. ___° (e.g., 45°)
6. ___° (e.g., 110°)
7. ___° (e.g., 100°)
8. ___° (e.g., 30°)
9. ___° (e.g., 40°)
10. ___° (e.g., 135°)
11. 90°
12. ___° (e.g., 50°)
```

> 💡 Remember: The actual values may vary slightly depending on your protractor and how you align it. This worksheet is designed to teach you how to measure — so your measured values are correct as long as you follow the steps properly!

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Let me know if you want a printable protractor or step-by-step video tutorial guidance! 😊